气候变化领域集成服务门户(CCPortal): A new lithium diffusion model in layered oxides based on asymmetric but reversible transition metal migration

CCPortal

DOI	10.1039/c9ee04123k
	A new lithium diffusion model in layered oxides based on asymmetric but reversible transition metal migration
	Ku K.; Kim B.; Jung S.-K.; Gong Y.; Eum D.; Yoon G.; Park K.-Y.; Hong J.; Cho S.-P.; Kim D.-H.; Kim H.; Jeong E.; Gu L.; Kang K.
发表日期	2020
ISSN	1754-5692
起始页码	1269
结束页码	1278
卷号	13 期号:4
英文摘要	Lithium-rich layered oxides (LLOs) are considered promising cathode materials for lithium-ion batteries because of their high reversible capacity, which is attributed to the exploitation of the novel anionic redox in addition to the conventional cationic redox process. Transition metal (TM) migration, which is known to be the main cause of the voltage decay in LLOs, is now understood to also be the critical factor triggering anionic redox, although this origin is still under debate. A better understanding of the specific TM migration behavior and its effect during charge/discharge would thus enable further development of this class of materials. Herein, we demonstrate that the unique TM migration during charge/discharge significantly alters the lithium diffusion mechanism/kinetics of LLO cathodes. We present clear evidence of the much more sluggish lithium diffusion occurring during discharge (lithiation) than during charge (de-lithiation), which contrasts with the traditional lithium diffusion model based on simple topotactic lithium intercalation/deintercalation in the layered framework. The reversible but asymmetric TM migration in the structure, which originates from the non-equivalent local environments around the TM during the charge and discharge processes, is shown to affect the lithium mobility. This correlation between TM migration and lithium mobility led us to propose a new lithium diffusion model for layered structures and suggests the importance of considering TM migration in designing new LLO cathode materials. © The Royal Society of Chemistry.
语种	英语
scopus关键词	Cathode materials; Cathodes; Diffusion; Lithium-ion batteries; Transition metal compounds; Transition metals; Charge and discharge; High reversible capacities; Layered Structures; Lithium diffusion; Lithium intercalation/de-intercalation; Lithium-rich layered oxides; Local environments; Reversible transitions; Lithium compounds; anion; correlation; electrode; exploitation; Lotka-Volterra model; model; reaction kinetics; redox conditions; redox potential; transition element
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162571
作者单位	Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, South Korea; Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul National University, Seoul, 08826, South Korea; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing, 100190, China; Center for Energy Materials Research, Korea Institute of Science and Technology, 5 Hwarang-ro 14 Gil Seongbuk-gu, Seoul, 02792, South Korea; National Center for Inter-University Research Facilities, Seoul National University, Seoul, 08826, South Korea; Korea Atomic Energy Research Institute (KAERI), 111 Daedeok-daero 989 Beon-Gil Yuseong-gu, Daejeon, 34057, South Korea; Institute of Engineering Research, College of Engineering, Seoul National University, Seoul, 08826, South Korea
推荐引用方式 GB/T 7714	Ku K.,Kim B.,Jung S.-K.,et al. A new lithium diffusion model in layered oxides based on asymmetric but reversible transition metal migration[J],2020,13(4).
APA	Ku K..,Kim B..,Jung S.-K..,Gong Y..,Eum D..,...&Kang K..(2020).A new lithium diffusion model in layered oxides based on asymmetric but reversible transition metal migration.Energy and Environmental Science,13(4).
MLA	Ku K.,et al."A new lithium diffusion model in layered oxides based on asymmetric but reversible transition metal migration".Energy and Environmental Science 13.4(2020).